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Kiln storage carrots 4 points
Carrots in our province are about to be harvested, and during the peak season, the abundance of supply often leads to lower prices and reduced income for farmers. To combat this, using kiln storage for off-season sales can significantly improve economic returns for growers. Here's a detailed guide on how to implement this storage method effectively:
First, it's crucial to harvest at the right time. In central and southern Hebei Province, carrots typically take 100–130 days to mature. The ideal harvest period is early November. Harvesting too early may reduce yield, while delaying it increases the risk of frost damage, which can affect both quality and storage potential.
Second, selecting and preparing the storage site is essential. In the North China Plain, the frozen soil layer is usually around 1 meter deep, so the kiln should be dug about 2 meters deep. Carrots stored too shallow are prone to freezing, while those stored too deep may suffer from heat damage. Choose a location that is dry, sheltered from wind, has deep and compact soil, and a low groundwater level. Dig a pit measuring 3 meters long, 1.6 meters wide, and 2 meters deep. Smooth the walls and floor thoroughly. On one of the side walls—either east or west—install a diagonal ventilation hole, making sure it doesn't reach the bottom to prevent cold air from directly affecting the carrots. Create an entrance on the south or north side for easy access. Place wooden sticks or bamboo rafts on top of the kiln and cover with corn stalks or rice straw, ensuring a 30-centimeter thick layer for insulation.
Third, prepare the base of the kiln. Start by laying a 10 cm layer of river sand at the bottom. Then, place the carrots in layers, ensuring they are free from disease, injuries, and blemishes. Each layer should be 60–80 cm high, and then covered with another 10 cm layer of wet sand. This helps maintain moisture and prevents the carrots from drying out.
Fourth, monitor temperature and humidity throughout the storage period. The ideal temperature for winter carrot storage is between 0°C and 1°C. If the temperature rises above 3°C, the carrots may sprout, while below -2°C, they risk freezing. As outside temperatures drop, gradually close the kiln door and ventilation holes. When temperatures fall below -10°C, cover the top of the kiln with corn stalks or straw for additional insulation. As spring approaches, slowly remove the extra covering but don’t remove everything. Gradually open the ventilation holes to allow cooling. Keep the humidity of the sand between 70% and 80%. If the sand becomes too dry, replace it with wet sand to maintain optimal conditions. Farmers can adjust the timing of sale based on local market demand, allowing for better profit margins.
By following these steps, farmers can maximize their profits and ensure high-quality carrots are available even when fresh produce is scarce.